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Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5

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mechanic:
Question: Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:

Options are:


A.     16 hours
B.     18 hours
C.     20 hours
D.     24 hours

Correct answer is:

D.     24 hours

Lovening:

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